Got 3:42 in the end, took me quite a moment to realize I needed to press and hold (and then keep holding) to hear the door tone. Could nicely hint to this by just auto playing the full door tone shortly after entering the room, and displaying a right mouse down button while it’ still playing (a nice show vs telling a bunch of things up front which wont’ make sense till you see it).
Thereafter, very fun mechanic of needing to put the stage into a specific way, but needing to move other platforms off their final values to get fix the others